first commit

src/server/agent/state.py

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+import operator
+from typing import Annotated, Sequence, TypedDict, Union
+from langchain_core.messages import BaseMessage
+
+class AgentState(TypedDict):
+    # messages 存储完整的对话历史，operator.add 表示新消息是追加而不是覆盖
+    messages: Annotated[Sequence[BaseMessage], operator.add]
+    # next 存储 Supervisor 决定的下一步是谁
+    next: str